/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineGroupsInterface.h
Delegate fired when a group is updated. We only receive notifications for groups for which one of the logged-in players is a member.
typedef TMulticastDelegate_OneParam< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & > FOnGroupUpdated